antennal plates longer than rostrum, apical spine acute ; antennae slender, 
long, reaching to base of telson, epistoma much wider than long, truncate, 
maxillipedes barbate on inner side and below : inner margin ot hand and 
movable finger with two rows of teeth, contiguous margins of fingers tuber- 
culate, exterior one hairy at base, both fingers ribbed and punctate above , 
third joint of third thoracic legs hooked: first abdominal legs long, bifid, 
nearly straight, exterior part longer, recurved, interior part recurved, ob- 
tuse, not enlarged near apex, tubercles on inner basal angles small. This 
species resembles the above, but differs from it in having a wider, more con- 
cave rostrum, with parallel sides, a depressed dorsum, wider epistoma, more 
coarsely bearded maxillipedes, longer abdominal legs, and the absence of 
enlargement near apex of interior part. Habitat : Baraboo river, Ironton ; 
Wisconsin river, Sauk City, Wisconsin. 
Eubranchipus hundyi , Forbes. This species, sent me by my friend 
Prof. Bundy, was taken by him at Jefferson, Wis. The specimens seen 
were somewhat smaller than average individuals of E. serratus, the thorax 
shorter and the abdomen more slender. The latter is similar to the abdo- 
men of E. vernalis, while the claspers and frontal appendages are more like 
those of E. serratus. 
The antennae extend ab.ut one-third their length beyond the eyes. 
The frontal appendages are long and narrow, widest at b5.se and regularly 
tapering, serrate within and on outer margin of tip with short blunt even 
teeth. The under surface is covered with short blunt spines or tubercles. 
These appendages are attached by a transverse line to the front of 
the head, just within the base of the claspers, and are about three times as 
long as the basal joint of the latter. 
The claspers resemble in size, general form and position those of E. 
serratus. The tubercle at the base of the first joint is larger and situated 
farther forward, extending far enough to the front to meet its fellow of the 
opposite side before the labrum. The opposed edges are somewhat rough- 
ened. The labrum is large and extends forward in the form of a stout 
tubercle, truncate at its extremity. This process is embraced by the con- 
cave posterior internal margins of the basal tubercles of the claspers The 
second joint of the clasper is thick at base, but tapers more rapidly than in 
E. serratus. The long and slender tooth of the latter is replaced by a thick 
rounded tubercle extending directly inward and covered by elevated disks, 
or truncate papillae, like the tip of the tooth in the species just mentioned. 
Unlike the latter, these papillae are wanting at the tip of the joint, which is 
expanded and distinctly bifid. 
The margins of the abdomen are not distinctly serrate, the last segment 
is not connate with the penultimate, nor is the tip ot the abdomen broader 
than the preceding segments. 
The caudal stylets are broad and blunt, not rounded at base, usually a 
little longer than the last three abdominal segments, and ciliate their whole 
length. The ovisac of the female is nearly as broad as long, with a large 
median lobe behind, and no other posterior processes. 
